【摘要】：隨著國內(nèi)基礎(chǔ)建設(shè)的高速發(fā)展,我國沿海地區(qū)修建了大量的鋼筋混凝土橋梁,這些橋梁工程耗資巨大,關(guān)系到國計民生,大多需要長達百年的服役期限。然而,惡劣的海洋環(huán)境長年累月地對其進行侵蝕,導(dǎo)致混凝土不可避免地逐漸老化、損傷甚至破壞。當(dāng)前橋梁工程的耐久性狀態(tài),引起了工程界對耐久性設(shè)計及評估的重視,但是業(yè)內(nèi)對橋梁耐久性和剩余壽命的評估尚無統(tǒng)一認識,耐久性設(shè)計意識匱乏。因此,對混凝土結(jié)構(gòu)耐久性進行研究,并以此推動工程應(yīng)用具有重大意義。本文對耐久性研究課題進行整體梳理,從環(huán)境、材料、構(gòu)件和結(jié)構(gòu)等不同的角度入手,研究耐久性狀態(tài)的損傷和評價。首先通過研究海洋環(huán)境的特點,對結(jié)構(gòu)環(huán)境作用進行分類;其次分別研究了海洋環(huán)境對混凝土和鋼筋材料的影響,進而對兩者的損傷機理進行分析總結(jié)。在模擬材料損傷過程的同時,分析了材料損傷過程中力學(xué)性能的變化;然后研究分析了鋼筋銹脹的損傷過程及破壞形態(tài),總結(jié)了現(xiàn)今應(yīng)用廣泛的多個鋼筋銹脹模型,通過算例分析對比各個模型的優(yōu)缺點;重點研究了氯離子侵蝕的數(shù)學(xué)模型,對已有的經(jīng)典模型進行修正,并給出了模型中各個數(shù)據(jù)的選取辦法及建議值,使其能夠良好地應(yīng)用在橋梁耐久性狀況監(jiān)測中;最后,本文通過對混凝土結(jié)構(gòu)耐久性準則的分析,利用剩余壽命的評定方法,建立起一套針對耐久性狀況的數(shù)學(xué)評估辦法。模型應(yīng)用了模糊數(shù)學(xué)綜合評判法,為橋梁結(jié)構(gòu)建立層次清晰的評判框架,并采用了隸屬函數(shù)及貼近度原則,給出了解析矩陣和評判結(jié)論。本文通過對依托工程的實例分析,對該套評判系統(tǒng)的應(yīng)用意義進行了驗證。
[Abstract]:With the rapid development of domestic infrastructure, a large number of reinforced concrete bridges have been built in the coastal areas of China. These bridges cost a lot and are related to the national economy and the people's livelihood, and most of them require a service period of up to a hundred years. However, the severe marine environment erodes it year after year, which leads to the gradual aging, damage and even destruction of concrete. At present, the durability state of bridge engineering has aroused the attention of the engineering circles to the durability design and evaluation, but there is no unified understanding of the bridge durability and residual life evaluation in the industry, and the awareness of durability design is lacking. Therefore, it is of great significance to study the durability of concrete structure and to promote engineering application. In this paper, the durability research topic is combed as a whole, and the damage and evaluation of durability state are studied from different angles of environment, materials, components and structures. Firstly, by studying the characteristics of marine environment, the effects of structural environment are classified. Secondly, the effects of marine environment on concrete and reinforced materials are studied respectively, and the damage mechanism of both is analyzed and summarized. At the same time of simulating the damage process of materials, the change of mechanical properties in the process of material damage is analyzed, and then the damage process and failure form of steel bars are studied and analyzed. The advantages and disadvantages of each model are analyzed and compared by example, the mathematical model of chloride erosion is studied emphatically, the existing classical model is modified, and the method of selecting each data and the suggested value in the model are given. Finally, through the analysis of durability criterion of concrete structure and the evaluation method of residual life, a set of mathematical evaluation method for durability condition is established. The fuzzy mathematics comprehensive evaluation method is used in the model to establish a clear hierarchy evaluation framework for bridge structure. The membership function and the principle of closeness degree are adopted, and the analytical matrix and evaluation conclusions are given. In this paper, the application significance of the evaluation system is verified by the analysis of the supporting engineering.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446

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本文編號：2269803